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. 1983 Apr;78(4):693–699. doi: 10.1111/j.1476-5381.1983.tb09422.x

Pharmacological characterization of the opioid receptor in the submucous plexus of the guinea-pig oesophagus.

Y Kamikawa, Y Shimo
PMCID: PMC2044750  PMID: 6303485

Abstract

1 The cholinergically mediated electrically-induced contractions of the submucous plexus-longitudinal muscularis mucosae preparation of the guinea-pig oesophagus were used to study the actions of opioid peptides and morphine. 2 The twitch contractions of the tissue (0.1 Hz, 0.5 ms, supramaximal voltage) were inhibited by all the opioid peptides and morphine in a concentration-dependent manner. The order of potency was dynorphin-(1-13) greater than alpha-neo-endorphin greater than beta-endorphin greater than [D-Ala2]-methionine-enkephalin much greater than alpha-endorphin, methionine-enkephalin, leucine-enkephalin and morphine. 3 The inhibitory actions of dynorphin-(1-13) (20 nM), alpha-neo-endorphin (100 nM) and beta-endorphin (3 microM) were completely reversed either by naloxone (1 microM) or by morphine (100 microM). The Ke values of naloxone against dynorphin-(1-13) and alpha-neo-endorphin were 30 and 25 nM, respectively. 4 Increasing the concentration of calcium from 1.8 to 3.6 mM in Tyrode solution decreased the sensitivity of the tissue to dynorphin-(1-13) 7.4 times and to alpha-neo-endorphin 462 times. 5 The inhibitory actions of dynorphin-(1-13) (100 nM) and alpha-neo-endorphin (300 nM) were inversely related to stimulus frequency, being most active at low frequencies (0.1-1 Hz), and least active at high (30 Hz). 6 Exogenously applied acetylcholine produced concentration-dependent contractions of the isolated muscularis mucosae, with an EC50 of 72.6 +/- 4.5 nM. The contractile response of the oesophagus to acetylcholine was not affected by the pretreatment of the tissue with dynorphin-(1-13) (100 nM), alpha-neo-endorphin (300 nM) or beta-endorphin (3 microM). 7 It is concluded that the submucous plexus-longitudinal muscularis mucosae of the guinea-pig oesophagus is inhibited by opioid peptides acting at prejunctional opioid receptors, probably of the kappa-subtype.

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Selected References

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